Fixed #35308 -- Handled OSError when launching code formatters.

Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>

tests/admin_scripts/tests.py

@@ -16,6 +16,8 @@ import unittest
 from io import StringIO
 from unittest import mock
 
+from user_commands.utils import AssertFormatterFailureCaughtContext
+
 from django import conf, get_version
 from django.conf import settings
 from django.core.management import (
@@ -2943,6 +2945,16 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
                     expected_mode,
                 )
 
+    def test_failure_to_format_code(self):
+        with AssertFormatterFailureCaughtContext(self) as ctx:
+            call_command(
+                "startapp",
+                "mynewapp",
+                directory=self.test_dir,
+                stdout=ctx.stdout,
+                stderr=ctx.stderr,
+            )
+
 
 class StartApp(AdminScriptTestCase):
     def test_invalid_name(self):